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DSP-free single-wavelength 100 Gbps SDM-PON with increased splitting ratio using 10G-class DML
Optics Express
|December 28, 2019
Summary
This study demonstrates over 100 Gbps space-division multiplexing passive optical networks (SDM-PONs) using cost-effective lasers and advanced fiber optics. The system achieves high capacity and splitting ratios without complex digital signal processing.
Area of Science:
- Telecommunications Engineering
- Optical Networking
- Fiber Optics
Background:
- Passive optical networks (PONs) are crucial for broadband access.
- Increasing demand for higher bandwidth necessitates advanced network architectures.
- Existing PONs face limitations in capacity and splitting ratio.
Purpose of the Study:
- To develop a space-division multiplexing passive optical network (SDM-PON) exceeding 100 Gbps.
- To enhance system performance using cost-effective components and novel architectures.
- To explore a promising solution for future high-capacity access networks.
Main Methods:
- Utilizing commercial 10G-class directly modulated lasers (DMLs) with 25/28 Gbps signals.
- Employing polarization-diversity micro-ring resonators (PD-MRRs) for improved extinction ratio (ER).
- Using high-count multi-core fiber (HC-MCF) with low crosstalk (XT) for increased capacity and splitting ratio.
- Implementing separate cores for upstream (US) and downstream (DS) transmission to mitigate noise.
- Leveraging time-division multiplexing (TDM) compatibility to further boost splitting ratio.
- Proposing both symmetric and asymmetric SDM-PON architectures.
Main Results:
- Demonstrated SDM-PON systems with transmission capacity beyond 100 Gbps.
- Achieved high splitting ratios enabled by HC-MCF and TDM compatibility.
- Successfully avoided Rayleigh backscattering noise by using distinct fiber cores for US/DS.
- Validated the effectiveness of PD-MRRs in enhancing extinction ratio.
- Showcased the potential of simple intensity modulation/direct detection (IM/DD) without digital signal processing (DSP).
Conclusions:
- The proposed SDM-PON architecture offers a viable path towards ultra-high capacity access networks.
- The system's compatibility with existing technologies and simple modulation scheme makes it cost-effective.
- This approach is a promising candidate for future large-capacity and high splitting ratio networks.
